Without a Google Account, you'll no longer have access to some apps and services on your device.

Google Play: You won’t be able to download or update apps or games from the Play Store. You also won’t be able to use music, movies, books, or magazines you purchased. This includes any music you purchased outside of Google Play that was uploaded into your music locker. Game progress, achievements, and other data associated with your Google Account in Google Play Games may be lost.

Contacts: Contacts stored only in your Google Account will be lost and might not sync to your devices.

Drive: Data won’t be saved to Drive or backed up through Android Backup Service. This includes photos taken with your device or documents downloaded from emails. You won't be able to download or upload files.